OpenGL2, Почему не отображается текстура на квадрате?

Вот код, текстуры не видно, вместо нее какая-то текстура как шахматная доска

#include <GL/glut.h>
#include <GL/gl.h>
#include <stdio.h>

unsigned char* loadBMPRaw(const char* imagepath, unsigned int& outWidth, unsigned int& outHeight, bool flipY) {
   printf("Reading image %s\n", imagepath);
   outWidth = -1;
   outHeight = -1;

   unsigned char header[54];
   unsigned int dataPos;
   unsigned int imageSize;

   unsigned char* data;

   FILE* file = fopen(imagepath, "rb");
   if (!file) { printf("Image could not be opened\n"); return NULL; }


   if (fread(header, 1, 54, file) != 54) {
      printf("Not a correct BMP file\n");
      return NULL;
   }

   if (header[0] != 'B' || header[1] != 'M') {
      printf("Not a correct BMP file\n");
      return NULL;
   }

   if (*(int*)&(header[0x1E]) != 0) { printf("Not a correct BMP file\n");    return NULL; }
   if (*(int*)&(header[0x1C]) != 24) { printf("Not a correct BMP file\n");    return NULL; }

   dataPos = *(int*)&(header[0x0A]);
   imageSize = *(int*)&(header[0x22]);
   outWidth = *(int*)&(header[0x12]);
   outHeight = *(int*)&(header[0x16]);

   if (imageSize == 0)    imageSize = outWidth * outHeight * 3;
   if (dataPos == 0)      dataPos = 54;

   data = new unsigned char[imageSize];

   fread(data, 1, imageSize, file);

   fclose(file);

   if (flipY) {
      unsigned char* tmpBuffer = new unsigned char[outWidth * 3];
      int size = outWidth * 3;
      for (int i = 0; i < outHeight / 2; i++) {
         memcpy_s(tmpBuffer, size, data + outWidth * 3 * i, size);
         memcpy_s(data + outWidth * 3 * i, size, data + outWidth * 3 * (outHeight - i - 1), size);
         memcpy_s(data + outWidth * 3 * (outHeight - i - 1), size, tmpBuffer, size);
      }
      delete[] tmpBuffer;
   }

   return data;
}

int main(int argc, char** argv)
{
   glutInit(&argc, argv);
   glutInitDisplayMode(GLUT_RGBA);
   glutInitWindowSize(800, 600);
   glutCreateWindow("windowname");

   unsigned int x, y;
   unsigned char* texDat = loadBMPRaw("wood.bmp", x, y, false);

   GLuint tex;
   glGenTextures(1, &tex);
   glBindTexture(GL_TEXTURE_2D, tex);
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
   glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE, 8, 8, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE, texDat);

   glMatrixMode(GL_PROJECTION);
   glOrtho(0, 800, 0, 600, -1, 1);
   glMatrixMode(GL_MODELVIEW);

   glClear(GL_COLOR_BUFFER_BIT);
   glBindTexture(GL_TEXTURE_2D, tex);
   glEnable(GL_TEXTURE_2D);
   glBegin(GL_QUADS);
   glTexCoord2i(0, 0); glVertex2i(100, 100);
   glTexCoord2i(0, 1); glVertex2i(100, 500);
   glTexCoord2i(1, 1); glVertex2i(500, 500);
   glTexCoord2i(1, 0); glVertex2i(500, 100);
   glEnd();
   glDisable(GL_TEXTURE_2D);
   glBindTexture(GL_TEXTURE_2D, 0);
   glFlush();

   system("pause");

   return 0;
}